I’m getting annoyed with people that ask a question, have the community answer their question and troubleshoot over several days, only to delete their post and the solution.
The person asking the question is often providing the least amount of effort, so why should they have exclusive right to delete the contributions of others?
Possible fix: have a per-community option to only request deletion.
As I understand it the distinction between a website hosting user content and another publisher is Section 230, but that is about limiting liability for publishing user content, and I see no reason to believe that this law would prohibit users from granting such websites non-revocable rights to publish their writing.